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中文摘要：
深部地下工程围岩破坏后形成较大范围的破裂岩体，在有效支护条件下具有结构效应，即具有一定的承载和抵抗变形能力，且在其承载和抵抗变形的过程中呈现应力强化的特性；同时，在破裂岩体内部存在岩块的再破坏和岩体力学性能弱化的过程；破裂岩体承载过程中应力状态及其力学特性的演化，取决于岩体整体力学性能、约束状态及初始破裂面的特征；在再承载过程中，破裂面上的主应力方向和大小均会发生变化，且破裂面上主应力方向和岩体的主应力方向并不一致，从而导致新的破裂面的形成和发展。研究反映破裂岩体的承载和再破坏特性，对深部地下工程的稳定控制研究具有一定的指导意义。
英文摘要：
The underground rock after failure forms cracked rock mass in a certain area, which represents great structural effect under effective support, namely, it has the capacity of load-carrying and resisting deformation. During the process of resisting the outer load or deformation, the cracked rock mass shows the stress hardening characteristic. Under outer-loading, the rock blocks within the cracked rock mass produce re-fracture and the degradation of rock mechanical behavior. The evolution of stress state and mechanical behavior of cracked rock mass when bearing outer load are determined by the integral mechanical performance of cracked rock mass, the stress state of hoop constraint and the characteristics of initial failure surface. When re-loaded on cracked rock mass, both the direction and magnitude of principal stress on the failure surface change gradually and the direction of principal stress on failure surface is different from that of rock mass, by which the new failure surfaces form and develop sequentially. This research reflects the load-carrying properties and re-fracturing process of cracked rock mass, which is very significant for study of stability of deep underground engineering.
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